Bug#891249: linux: unstable kernel/data corruption on ppc64el

From	Breno Leitao <brenohl@br.ibm.com>
Newsgroups	linux.debian.bugs.rc
Subject	Bug#891249: linux: unstable kernel/data corruption on ppc64el
Date	2018-02-26 15:10 +0100
Message-ID	<vnrDA-7EM-25@gated-at.bofh.it> (permalink)
References	<vmqJz-841-1@gated-at.bofh.it> <vmqJz-841-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Hi,

On 02/23/2018 03:52 PM, Aurelien Jarno wrote:

> DSA has installed the latest security kernel (4.9.82-1+deb9u2) on the
> Debian POWER8 machines running ppc64el. While they boot correctly, then
> programs segfault randomly (apt, sbuild, systemd, etc...). Passing
> no_rfi_flush to the command line does not change anything. Looking more
> in details, things looks scarying as some code actually get wrongly
> executed. Here are some build logs examples:
> - https://buildd.debian.org/status/fetch.php?pkg=python-msgpack&arch=ppc64el&ver=0.5.1-1&stamp=1519399908&raw=0
> - https://buildd.debian.org/status/fetch.php?pkg=python-msgpack&arch=ppc64el&ver=0.5.1-1&stamp=1519396907&raw=0
> - https://buildd.debian.org/status/fetch.php?pkg=tk8.5&arch=ppc64el&ver=8.5.19-3&stamp=1519362938&raw=0
> 
> While in the above case the packages fail to build from source, I guess
> there are also some cases of undetected corruptions.
> 
> I'll try to run the 4.9.80-2 kernel at some point to narrow down the
> issue.

I talked to the powerpc maintainer about this problem, and in fact this is a knew
problem, since the 4.4 patches were 'backported' to 4.9 without success.

This is already fixed and in the stable tree already:

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/log/arch/powerpc?h=linux-4.9.y

I understand that the commit ids are:
 * 3146a32b39cd78722869bca6e839b3c59155e012
 * efe8bc07c47fff196bbc0822e249a27ae0574d24
 * ec0084d082137b73460303b39f4089970a213ad7

But I suppose that Debian will do a full merge with the stable tree, then, I expect
that the next release will just work.

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Bug#891249: linux: unstable kernel/data corruption on ppc64el Breno Leitao <brenohl@br.ibm.com> - 2018-02-26 15:10 +0100

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